EP0423228B1 - Immunokonjugate für krebs-diagnose und -therapie - Google Patents

Immunokonjugate für krebs-diagnose und -therapie Download PDF

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EP0423228B1
EP0423228B1 EP89908605A EP89908605A EP0423228B1 EP 0423228 B1 EP0423228 B1 EP 0423228B1 EP 89908605 A EP89908605 A EP 89908605A EP 89908605 A EP89908605 A EP 89908605A EP 0423228 B1 EP0423228 B1 EP 0423228B1
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gelonin
antibody
cells
tumor
antigen
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EP0423228A1 (de
EP0423228A4 (en
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Michael G. Rosenblum
Renato Dulbecco
W. Ross Allen
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Research Development Foundation
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
    • C07K16/3015—Breast
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A61K39/44—Antibodies bound to carriers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6851—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell
    • A61K47/6855—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell the tumour determinant being from breast cancer cell
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6851—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell
    • A61K47/6869—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell the tumour determinant being from a cell of the reproductive system: ovaria, uterus, testes, prostate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
    • C07K16/3069—Reproductive system, e.g. ovaria, uterus, testes, prostate
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K17/00—Carrier-bound or immobilised peptides; Preparation thereof
    • C07K17/02—Peptides being immobilised on, or in, an organic carrier
    • C07K17/08—Peptides being immobilised on, or in, an organic carrier the carrier being a synthetic polymer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57407—Specifically defined cancers
    • G01N33/57411—Specifically defined cancers of cervix
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57407—Specifically defined cancers
    • G01N33/57415—Specifically defined cancers of breast
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57469—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving tumor associated glycolinkage, i.e. TAG
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation

Definitions

  • the present invention relates generally to the field of immunoconjugates and, more particularly, to the use of immunoconjugates in the diagnosis and treatment of cancer.
  • the invention also relates to cytotoxic conjugates of monoclonal antibodies (MoAbs) and gelonin, a ribosomal inhibiting protein, for the treatment of breast and cervical carcinoma.
  • MoAbs monoclonal antibodies
  • gelonin a ribosomal inhibiting protein
  • tumors express antigens or antigenic determinants which are either expressed very weakly or not expressed at all by normal cells.
  • Some tumor cells express antigens which are expressed by embryonic cell types but are not expressed by normal cells of a mature animal. These abnormally expressed antigens are known as tumor-associated antigens.
  • the antigens expressed by tumors are specific in that while a particular antigen may be expressed by more than one tumor, it is usually expressed by all or most cells of the particular tumors which express it.
  • a tumor cell may express one or more than one tumor-associated antigen. These tumor-associated antigens may be expressed on the surface of the cell (cell surface antigen), may be secreted by the tumor cell (secreted antigens) or may remain inside the cell (intercellular antigen).
  • tumor-associated antigens The presence of these tumor-associated antigens has been utilized to detect, diagnose and localize the tumor. In some cases the presence of the tumor-associated antigens on the tumor cells has allowed the targeting of specific drugs and treatment means specifically to the tumor cells.
  • Antibodies are proteins normally produced by the immune system of an animal in response to foreign antigens or antigenic determinants. Antibodies bind to the specific antigen to which they are directed. Monoclonal antibodies directed to specific antigens or antigenic determinants may be prepared in large quantities.
  • Antibodies may be labelled in order to allow their use for localization and treatment of malignant diseases.
  • Antibodies, coupled to drugs, may be used as a delivery system by which the drug is targeted to a specific tumor cell type against which the antibody is directed.
  • Antibodies may also be coupled to toxins and thus act as a delivery system to target the toxins directly to specific tumor cells.
  • Gelonin is a glycoprotein (M.W. 29-30,000) purified from the seeds of Gelonium multiforum .
  • Gelonin belongs to a class of potent ribosomal inactivating plant toxins.
  • Other members of this class of ribosomal inactivating plant toxins are the chains of Abrin, Ricin and Modeccin.
  • Gelonin like abrin and ricin, inhibits protein synthesis by damaging the 60S sub-unit of mammalian ribosomes. The inactivation of ribosomes is irreversible, does not appear to involve co-factors and occurs with an efficiency which suggests that Gelonin acts enzymatically.
  • Gelonin and ricin are among the most active toxins in inhibiting protein synthesis on a protein weight basis. Gelonin is 10 to 1000 times more active in inhibiting protein synthesis than the ricin A chain. Peptides like ricin and abrin are composed of two chains, an A chain which is the toxic unit and a B chain which acts by binding to cells. Unlike ricin and abrin, gelonin is composed of a single chain, and, lacking a B chain for binding to cells, is itself non-toxic to intact cells. (Stirpe, et al. J. Biol. Chem. 255 : 6947-6953 (1980)). Mammalian cells apparently lack the ability to bind and/or to internalize the native gelonin molecule.
  • Conjugates of gelonin to a tumor-targeting monoclonal antibody such as the monoclonal antibody 15A8 directed to an antigen present on certain tumor cells such as breast cancer cells, provides both a specific method for binding the gelonin to the cell and a route for internalization of the gelonin-antibody complex.
  • a tumor-targeting monoclonal antibody such as the monoclonal antibody 15A8 directed to an antigen present on certain tumor cells such as breast cancer cells
  • Radiolabelled antibodies suffer from problems which limit or complicate their use as the therapeutic agents. For example, metabolic or enzymatic degradation of the antibody may release the radiolabel and allow it to distribute to other tissues such as kidneys or bone marrow, causing unacceptable radiation damage to these organs.
  • the present invention provides a method of making a composition of matter comprising conjugating 15A8 antibody and a moiety selected from cytotoxic moieties and detectable labels.
  • the antibody is coupled with a toxin selected from the group consisting of gelonin, ricin A chain and abrin A chain.
  • the 15A8 antibody may be coupled with a cytocidal drug such as adriamycin.
  • the antibody may be labelled with a detectable label such as a radiolabel, a chemiluminescer, a fluorescer, or an enzyme label.
  • the invention provides a method of conjugating gelonin to 15A8 antibody comprising modifying 15A8 antibody with N-succinimidyl-3-(2-pyridyldithio)propionate (SPDP); removing the excess N-succinimidyl-3-(2-pyridyldithio)propionate (SPDP); modifying gelonin with iminothiolane (IT); removing the excess iminothiolane; conjugating said SPDP-modified 15A8 antibody with said iminothiolane-modified gelonin; and purifying said conjugate of said 15A8 antibody and gelonin.
  • SPDP N-succinimidyl-3-(2-pyridyldithio)propionate
  • SPDP N-succinimidyl-3-(2-pyridyldithio)propionate
  • IT iminothiolane
  • the cytocidal immunoconjugates are useful to treat and prevent recurrence of tumor-associated 15A8-bearing tumors by administration of these cytocidal immunoconjugates to an individual in need of such treatment.
  • the detectably labelled 15A8 immunoconjugates are useful for diagnosis and localization of tumors by techniques known to those in the art. These labelled immunoconjugates are also useful to assay for the presence of the 15A8 antigen in biological specimens and for localizing the tumor site in vivo by means known to those of skill in the art.
  • One of the objects of the present invention is to provide a cytotoxic composition which would specifically bind to and kill tumor cells. Specifically, it is an object of the present invention to provide a cytotoxic composition which would specifically bind to and kill tumor cells which express the 15A8 antigen (the antigen recognized by the monoclonal antibodies disclosed and claimed in US-A-5 032 521.
  • the composition of matter produced in the invention may be used in a method of killing human breast cancer cells, cervical carcinoma cells, or other tumor cells expressing the 15A8 antigen by contacting the cells with a cytocidally effective amount of the composition.
  • composition would be toxic to tumor cells and would cause minimal injury to normal tissue.
  • Figure 1 is a graph which demonstrates the 15A8-gelonin elution profile by G-75 Chromatography.
  • Figure 2 demonstrates the electrophoretic pattern of the 15A8-gelonin complex.
  • Figure 3 is a graph of the chromatographic elution profile of the G-75 eluate on Blue Sepharose.
  • Figure 4 demonstrates the protein synthesis inhibitory activity of the gelonin-15A8 antibody complex.
  • Figure 5 demonstrates the binding of the free 15A8 antibody complex to Me-180 cells.
  • Figure 6 demonstrates the anti-proliferative activity of 15A8-gelonin complex on non-target HS 294% cells.
  • Figure 7 demonstrates the antiproliferative activity of gelonin and gelonin-15A8 antibody complex on Me-180 cells.
  • Figure 8 demonstrates the antiproliferative activity of gelonin and gelonin-15A8 antibody complex on A431 cells.
  • the term "monoclonal antibody” means an antibody composition having a homogeneous antibody population. It is not intended to be limited as regards the source of the antibody or the manner in which it is made.
  • Breast carcinoma cells express a 22 kD antigen on their cell surface. Antibodies to this antigen have been produced. Specifically monoclonal antibodies of the IgG1, IgG 2a and IgG 2b isotypes which recognize an epitope of this 22 kD antigen have been produced. Hybridomas which recognize this 22 kD (producing predominantly the IgG1 isotype), 15A8 G 2a (producing predominantly IgG 2a isotype) and 15A8 G 2b (producing predominantly IgG 2b isotype). All isotype recognize the same epitope of the antigen which for the purpose of this invention will be designated the 15A8 epitope. Thus, all of these antibodies are functionally equivalent.
  • PAI myeloma cells obtained from Dr. Theo Staehlin, Basel, Switzerland, J. Stocker, Research Disclosure , 21713, 155-157 (1982) were resuspended for fusion in a 45% solution (v/v) of polyethylene glycol 1500.
  • the hybrid cells were selected on hypoxanthine-aminopterin thymidine (HAT) medium.
  • HAT hypoxanthine-aminopterin thymidine
  • Hybridomas producing antibodies which reacted with MCF-7 and/or MDA-157 cells but not human foreskin fibroblast cells were further characterized.
  • the antibodies produced by the 15A8 cell line and hybridomas-producing functionally equivalent antibodies reacted with the 15A8 antigen on MCF-7 cells.
  • the term "functional equivalent” means a monoclonal antibody that: (a) crossblocks an exemplified monoclonal antibody; (b) binds selectively to cells expressing the 15A8 antigen such as human breast cancer cells; (c) has a G or M isotype; (d) binds to the 15A8 antigen as determined by immunoprecipitation or sandwich immunoassay; and (e) when conjugated to gelonin, exhibits a tissue culture inhibitory dose (TCID) of at least 50% against at least one of the MCF-7, ME-180, BT-20, or A431 cell lines when used at a dose of 5-10 units per ml.
  • TID tissue culture inhibitory dose
  • Antibody 15A8 was conjugated to gelonin using N-succinimidyl-3-(2-pyridyldithio)propionate (SPDP) or iminothiolane (IT) as a coupling agent.
  • SPDP N-succinimidyl-3-(2-pyridyldithio)propionate
  • IT iminothiolane
  • the conjugates were tested against Me-180, and A431 cells in a 72-hour tissue culture assay.
  • the antibody conjugates exhibited acceptable antiproliferative activity (TCID 50% of less than 5 units/ml) against both of these cell lines.
  • immunotoxins conjugates of the 15A8 antibody and a cytotoxic moiety
  • labelled e.g., radiolabelled, enzyme-labelled, or fluorochrome-labelled
  • the cytotoxic moiety of the immunotoxin may be a cytotoxic drug or an enzymatically active toxin of bacterial or plant origin (gelonin), or an enzymatically active fragment ("A chain") of such a toxin.
  • Enzymatically active toxins and fragments thereof are preferred and are exemplified by gelonin, diphtheria A chain, nonbinding active fragments of diphtheria toxin, exotoxin A chain (from Pseudomonas aeruginosa ), ricin A chain, abrin A chain, modeccin A chain, alpha-sarcin, Aleurites fordii proteins, dianthin proteins, Phytoiacca americana proteins (PAPI, PAPII, and PAP-S), momordica charantia inhibitor, curcin, crotin, saponaria officinalis inhibitor, mitogellin, restrictocin, phenomycin, and enomycin. Most preferred is the conjugation with gelonin.
  • Cytotoxic drugs which are useful in the present invention include, but are not limited to, adriamycin (and derivatives thereof), cis-platinum complex (and derivatives thereof), bleomycin and methotrexate (and derivatives thereof). These cytotoxic drugs are sometimes useful for clinical management of recurrent tumors and particularly breast cancer, but their use is complicated by severe side effects and damage caused to non-target cells.
  • Antibody 15A8 may serve as a useful carrier of such drugs providing an efficient means of both delivery to the tumor and enhanced entry into the tumor cells themselves.
  • specific antibody delivery of cytotoxic drugs to tumors will provide protection of sensitive sites such as the liver, kidney and bone marrow from the deleterious action of the chemotherapeutic agents.
  • Use of drugs conjugated to antibody 15A8 as a delivery system allows lower dosage of the drug itself, since all drug moieties are conjugated to antibodies which concentrate within the tumor.
  • Conjugates of the monoclonal antibody may be made using a variety of bifunctional protein coupling agents.
  • reagents are SPDP, IT, bifunctional derivatives of imidoesters such as dimethyl adipimidate HCl, active esters such as disuccinimidyl suberate, aldehydes such as glutaraldehyde, bis-azido compounds such as bis(p-azidobenzoyl) hexanediamine, bis-diazonium derivatives such as bis-(p-diazoniumbenzoyl)-ethylenediamine, diisocyanates such as tolylene 2,6-diisocyanate, and bis-active fluorine compounds such as a 1,5-difluoro-2,4-dinitrobenzene.
  • imidoesters such as dimethyl adipimidate HCl
  • active esters such as disuccinimidyl suberate
  • aldehydes such as glutaraldehy
  • the conjugates When used to kill human breast cancer cells in vitro for diagnostic purposes, the conjugates will typically be added to the cell culture medium at a concentration of at least about 10 nM.
  • the formulation and mode of administration for in vitro use are not critical. Aqueous formulations that are compatible with the culture or perfusion medium will normally be used. Cytotoxicity may be read by conventional techniques to determine the presence or degree of breast cancer.
  • Cytotoxic radiopharmaceuticals for diagnosing and treating tumors carrying the 15A8 antigen such as breast cancer may be made by conjugating high linear energy transfer (LET) emitting isotopes (e.g., Y, Pr) to the antibodies.
  • LET linear energy transfer
  • cytotoxic moiety as used herein is intended to include such isotopes.
  • the labels that are used in making labeled versions of the antibodies include moieties that may be detected directly, such as fluorochromes and radiolabels as well as moieties, such as enzymes, that must be reacted or derivatized to be detected.
  • moieties such as 32P, 125I, 3H, 14C, fluorescein and its derivatives, rhodamine and its derivatives, dansyl, umbelliferone, luciferia, 2,3-dihydrophthalzainediones, horseradish peroxidase, alkaline phosphatase, lysozyme, and glucose-6-phosphate dehydrogenase.
  • the antibodies may be tagged with such labels by known methods.
  • coupling agents such as aldehydes, carbodiimides, dimaleimide, imidates, succinimides and bis-diazotized benzidine may be used to couple the antibodies with the above-described fluorescent, chemiluminescent, and enzyme labels.
  • the antibodies and labeled antibodies may be used in a variety of immunoimaging or immunoassay procedures to detect the presence of tumors expressing the 15A8 antigen such as breast cancer in a patient or monitor the status of such cancer in a patient already diagnosed to have it. When used to monitor the status of a cancer a quantitative immunoassay procedure may be used. Such monitoring assays are carried out periodically and the results compared to determine whether the patient's tumor burden has increased or decreased.
  • Common assay techniques that may be used include direct and indirect assays. Direct assays involve incubating a tissue sample or cells from the patient with a labeled antibody. If the sample 15A8 antigen bearing cells such as includes breast cancer cells, the labeled antibody will bind to those cells. After washing the tissue or cells to remove unbound labeled antibody, the tissue sample is read for the presence of labeled immune complexes.
  • kits will typically comprise: the antibody in labeled form in suitable containers, reagents for the incubations and washings, and substrates or derivatizing agents depending on the nature of the label.
  • Antigen 15A8 controls and instructions may also be included.
  • the immunotoxins of the present invention to an individual who has been diagnosed as having a tumor with the 15A8 antigenic determinant will allow targeting and concentration of the cytotoxic agent at the site where it is needed to kill the tumor cells. By so targeting the cytotoxic agents, non-specific toxicity to other organs, tissues and cells will be eliminated or decreased.
  • the immunotoxins When used in vivo for therapy, the immunotoxins are administered to the patient in therapeutically effective amounts (i.e., amounts that eliminate or reduce the patient's tumor burden). They will normally be administered parenterally, preferably intravenously.
  • the dose and dosage regimen will depend upon the nature of the cancer (primary or metastatic) and its population, the characteristics of the particular immunotoxin, e.g., its therapeutic index, the patient, and the patient's history.
  • the amount of immunotoxin administered will typically be in the range of about 0.1 to about 10 mg/kg of patient weight.
  • the immunotoxins will be formulated in a unit dosage injectable form (solution, suspension, emulsion) in association with a pharmaceutically acceptable parenteral vehicle.
  • a pharmaceutically acceptable parenteral vehicle Such vehicles are inherently nontoxic and nontherapeutic. Examples of such vehicles are water, saline, Ringer's solution, dextrose solution, and 5% human serum albumin. Nonaqueous vehicles such as fixed oils and ethyl oleate may also be used. Liposomes may be used as carriers.
  • the vehicle may contain minor amounts of additives such as substances that enhance isotonicity and chemical stability, e.g., buffers and preservatives.
  • the immunotoxin will typically be formulated in such vehicles at concentrations of about 0.1 mg/ml to 10 mg/ml.
  • Gelonin toxin was purified from the seeds of gelonin multiflorinum by the method of Stirpe, et al. supra. Briefly, gelonin was extracted from the seeds by homogenization in buffered saline solution (pH 7.4). The supernatant was concentrated after dialysis against 5 mM sodium phosphate (pH 6.5) and the gelonin further purified by ion exchange chromatography as described in Example 1. The purity of the gelonin toxin was assessed by high pressure liquid chromatography (HPLC) and sodium dodecylsulphate-polyacylamide gel electrophoresis (SDS-Page). Gelonin toxin migrated as a single band with an approximate molecular weight of 29-30,000 daltons.
  • HPLC high pressure liquid chromatography
  • SDS-Page sodium dodecylsulphate-polyacylamide gel electrophoresis
  • Gelonin toxin activity was measured as described in Example 2 by protein synthesis inhibition in a cell-free system.
  • Antibody 15A8G2 modified with SPDP as described in Example 5 was conjugated with iminothiolane modified gelonin as described in Examples 3 and 6.
  • the gelonin conjugated antibody was purified as described in Example 7 by column chromatography on a Sephadex G-75 column.
  • the toxicity of the gelonin-conjuated antibody was determined by protein synthesis inhibition and its antiproliferative activity was determined by in vitro and in vivo tests.
  • the gelonin activity was monitored in a cell-free protein synthesis inhibition assay.
  • the cell-free protein synthesis inhibition assay was performed by sequentially adding to 50 ⁇ l rabbit reticulocyte lysate, thawed immediately before use, mixing after each addition, the following components: 0.5 ml of 0.2 M Tris HCl (pH 7.8), 8.9 ml of ethylene glycol, and 0.25 ml of 1 M HCl).
  • SAEM salt-amino acid-energy mixture
  • 14C-leucine incorporation was monitored in an aliquot of the mixture by precipitating synthesized protein on glass fiber filters, washing in 10% TCA and acetone, and monitoring the radioactivity in a Beta-counter using Aquasol scintillation fluid.
  • Gelonin with a specific activity no lower than 4 x 109 U/mg was used for conjugation with the antibodies.
  • a unit of gelonin activity is the amount of gelonin protein which causes 50% inhibition of incorporation of [14C] leucine into protein in the cell free assay.
  • Gelonin in phosphate buffered saline was concentrated to approximately 2 milligrams/ml in a Centricon 10 microconcentrator.
  • Triethanolamine hydrochloride (TEA/HCl), pH 8.0 and EDTA were added to a final concentration of 60mM TEA/HCl and 1mM EDTA pH 8.0.
  • 2-Iminothiolane stock solution (20mM) was added to a final concentration of 1 mM and the sample was incubated for 90 minutes at 4°C under a stream of nitrogen gas.
  • Monoclonal antibodies may be made by methods known to those of skill in the art. The procedure for making the hybridoma cell cultures which produce these antibodies is described in detail in US-A-5 032 521 and in European Application Publication 0 184 369 (published 11 June 1986). Briefly, mammary tumor cells (Soule, et al , JNCI , 51 : 1409-1413 (1973) ATCC Accession No. HTB-22) were injected into BALB/c mice intraperitoneally every three weeks for a total of three to four injections. The spleens were harvested three days after the last injection and a spleen cell suspension was prepared and washed by two centrifugations (800 x g) in Dulbecco's modified Eagles medium.
  • mammary tumor cells Soule, et al , JNCI , 51 : 1409-1413 (1973) ATCC Accession No. HTB-22
  • Clones of the hybridoma were grown in vitro according to known tissue culture techniques such as is described by Cotten, et al. , Eur. J. Immunol . 3:136 (1973). Hybridomas producing antibodies which reacted with MCF-7 and/or MDA-157 cells but not human foreskin fibroblast cells were further characterized. The antibodies produced by the 15A8 cell line and hybridomos-producing functionally equivalent antibodies reacted with the 15A8 antigen on MCF-7 cells.
  • N-succinimidyl 3-(2-pyridyldithio) (propionate) in dimethylformamide was prepared as a stock solution of 3 mg/ml in dry dimethylforamide. Since the crystalline SPDP can undergo hydrolysis, the actual concentration of chemically reactive crosslinker was determined by spectrophotometric methods by analyzing the absorbance at 260 nm in a dual-beam spectrophotometer. The concentration of SPDP stock is calculated from the following equation: One milligram of monoclonal antibody 15A8 in 0.5 ml of PBS was added to a glass tube. SPDP stock solution was slowly added at a 5-fold molar excess to the tube, mixing constantly. The mixture was incubated for 30 minutes at room temperature, mixing every 5 minutes during the incubation period.
  • Monoclonal antibody 15A8 modified as described in Example 4 was mixed with an equal weight of gelonin modified as in Example 3. This proportion corresponded to a 5-fold molar excess of gelonin as compared to antibody.
  • the pH of the mixture was adjusted to 7.0 by the addition of 0.05 M TEA/HCl buffer pH 8.0 and the mixture was incubated for 20 hours at 4°C under nitrogen.
  • Iodoacetamide (0.1 M) was added to a final concentration of 2 mM to block any remaining free sulfhydryl groups and incubation was continued for an additional hour at about 25°C.
  • the reaction mixture was stored at 4°C. until purification by gel filtration.
  • Non-conjugated gelonin was removed from the reaction mixtures of Example 6 by gel filtration on a Sephadex G-75 column (1.6 x 31 cm) pre-equilibrated with PBS.
  • Reaction mixtures from Example 6 were concentrated to approximately 1 ml with a Centricon 30 microconcentrator before loading on the Sephadex column. The column was washed with PBS. One ml fractions were collected and 50 ⁇ l aliquots are analyzed for protein by the Bradford dye binding assay. M. Bradford, Anal. Biochem 72 :248 (1976).
  • Figure 1 demonstrates the elution profile of the G-75 column.
  • Figure 1 demonstrates the elution profile and demonstrates that gelonin can be separated from gelonin-antibody conjugate and unconjugated antibody, both of which coelute in the first peak (about fractions 38-52).
  • This elution pattern was confirmed by electrophoresis of 50 ⁇ l aliquots on 5-20% gradient non-reducing SDS polyacrylamide gels as shown on Figure 2. The coupling mixture was loaded on lane 3.
  • Non-conjugated antibody was removed from the gelonin conjugated antibody by affinity chromatography on a column (1 x 24 cm) of Blue Sepharose CL-6B pre-equilibrated with 10 mM phosphate buffer, pH 7.2 containing 0.1 M NaCl. After loading the G-75 eluate sample, the column was washed with 30 ml of the same buffer to completely elute non-conjugated antibody. Gelonin-conjugated antibody bound to the column and was eluted with a linear salt gradient of 0.1 to 2 M NaCl in 10 mM phosphate buffer, pH 7.2.
  • the antibody-gelonin complex eluted at approximately 0.7 M NaCl as shown on Figure 3 which depicts the elution profile of the Blue Sepharose column.
  • the flow-through peak contains only free antibody (Fig. 2, lane 5) while fractions 50-80, eluted with high salt, contain 15A8-gelonin conjugate free of unconjugated gelonin or antibody (Fig. 2, lane 6).
  • Protein content of the eluted fractions was determined by the Bradford dye binding assay.
  • the protein-containing fractions were pooled and the elution pattern confirmed by electrophoresis on a 5 to 20% gradient non-reducing polyacrylamide gel.
  • the electrophoretic pattern of the 15A8-gelonin complex is shown on Figure 2.
  • the rabbit reticulocyte in vitro translation system described in Example 3 was utilized to estimate the gelonin activity of the essentially pure gelonin-15A8 antibody complex.
  • the essentially pure gelonin-15A8 antibody is active in the reticulocyte lysate assay, A 1:1000 dilution of the original sample caused approximately a 50% inhibition of protein synthesis, i.e., a 50% reduction of the incorporation of 14C-leucine into protein.
  • the activity of the original preparation was 1000 U/ml.
  • the ability of the gelonin-conjugated and unconjugated 15A8 antibody to bind to target cells was assessed. Fifty thousand target cells (Me-180) or non-target human melanoma cells (AAB-527 cells) were added to each well of microtiter plate. The cells were dried on the plates overnight at 37°C. The cells were then washed with three changes of cold PBS and air dried overnight. The cell surface antigenic determinants remain antigenically active after this treatment.
  • washing Buffer (9.68 Tris, 64.8 sodium chloride, 16 ml Tween 20, 800 mg thimerasol in 8 l of double distilled water).
  • Antibody samples were diluted in Washing Buffer containing 1% Bovine serum albumin (w/v) (Diluting buffer).
  • Fifty microliters of various concentrations ranging from .05 to 50 ug/ml of either conjugated or unconjugated 15A8 antibody were added to the wells. After incubation for 1 hour at 4°C, the supernantants are removed and the wells washed twice with Washing Buffer.
  • the antiproliferative effects of gelonin and 15A8-gelonin complex was assessed by plating approximately 5,000 cells/well in microtiter plate in 200 ⁇ l of appropriate tissue culture media. The cells were allowed to adhere for 24 hours at 37°C in atmosphere of 5% CO2 in air. Non-targeted, antigen negative HS294 melanoma cells, antigen positive Me-180 and A-431 squamous carcinoma cells in log-phase were treated with various concentrations of either media alone (control), gelonin or 15A8-gelonin conjugate and incubated at 37°C in an atmosphere of 5% CO2 in air for 72 hours. The plates were washed three times with cold PBS.
  • Figure 7 demonstrates that at approximately 5 U/ml, gelonin conjugated 15A8 antibody inhibited 50% of the Me-180 cells, while a concentration of 107 U/ml of the unconjugated gelonin was required to achieve the same effect.
  • this immunotoxin is an efficient method to target and kill 15A8 tumor associated antigen containing cells while minimizing or preventing damage or injury to normal non-tumor associated antigen-bearing cells.
  • Antibody 15A8 conjugated with gelonin or gelonin alone (as a control) were tested for their activity against a highly tumorigenic variant of the human breast cancer cell lines MW (Chu, et al., Cancer Research 45 :1357-1366).
  • Female athymic BALB/c nu/nu mice (20-24 g) were injected in the right axillary region with 1.25 x 107 cells per animal in 0.5 ml.
  • the concentration of the gelonin or gelonin 15A8 conjugate was approximated assuming a ten-fold dilution of the injected dose in the blood volume of the animal. Based on the average tumor size and average tumor weight, the conjugate 15A8-gelonin reduced tumor growth to approximately 70%-75% of the tumor size and weight with the control unconjugated gelonin as shown below: Thus, it can be seen that with only one administration of the gelonin-15A8 complex the tumor size was reduced to 70%-75% of the tumor size with the control unconjugated gelonin. More frequent injections of the immunotoxin should be even more effective at reducing tumor burden.

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Claims (6)

  1. Verfahren zur Herstellung einer Zusammensetzung, umfassend das Konjugieren eines 15A8-Antikörpers und eines Anteils, ausgewählt aus einem cytotoxischen Anteil und einer nachweisbaren Markierung.
  2. Verfahren nach Anspruch 1, worin der Anteil ausgewählt ist aus einem Toxin, einem zelltötenden Arzneimittel und einer nachweisbaren Markierung.
  3. Verfahren nach Anspruch 2, worin der Anteil Gelonin ist.
  4. Verfahren zur Konjugation von Gelonin mit 15A8-Antikörper, umfassend daß man einen 15A8-Antikörper mit N-Succinimidyl-3-(2-pyridyldithio)propionat (SPDP) modifiziert; überschüssiges N-Succinimidyl-3-(2-pyridyldithio)propionat (SPDP) entfernt; Gelonin mit Iminothiolan (IT) modifiziert; überschüssiges Iminothiolan entfernt; den mit SPDP-modifizierten 15A8-Antikörper mit Iminothiolan modifiziertem Gelonin konjugiert und das Konjugat aus 15A8-Antikörper und Gelonin reinigt.
  5. Verfahren zur Herstellung einer Zusammensetzung, umfassend, daß man einen cytotoxischen Anteil an den monoklonalen 15A8-Antikörper kuppelt.
  6. Verfahren nach Anspruch 5, worin der Anteil Gelonin ist.
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